(19)

(11)

EP 0 547 144 A1

(12)

(43) Date of publication: 23.06.1993 Bulletin 1993/25 (21) Application number: 91916672.0 (22) Date of filing: 29.08.1991

(51) International Patent Classification (IPC):  A61B 17/ 44( . ) (86) International application number: PCT/US1991/006198 (87) International publication number: WO 1992/003978 (19.03.1992 Gazette 1992/07)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 06.09.1990 US 19900578819 (71) Applicant: BOARD OF REGENTS THE UNIVERSITY OF TEXAS SYSTEM Austin, Texas 78701 (US)	(72) Inventor: ELLIOTT, Bryon, D. San Antonio, TX 78250 (US) (74) Representative: Frankland, Nigel Howard  FORRESTER & BOEHMERT Franz-Joseph-Strasse 38 D-80801 München D-80801 München (DE)